Installation Manual

10 Issue 1 AIS Installation Manual
5 Mechanical mounting options and guidelines
5.1 Location
The transponder unit is classed as protected equipment and thus should be located inside in a
dry environment. Normally the transponder is located in the Radio Room. The transponder
compass safe distance is 2.1 m.
The recommended location should provide:
A dry environment
Access to connections (eg antennas, power, sensors)
Minimal shock and vibration
An ambient temperature between -15 °C and +55 °C
A site clear of exhausts and vents
Sufficient space to allow maintenance
The transponder does not require external illumination during operation. Naturally, some form of
illumination should be provided while installing or maintaining the transponder.
The Display should be available to the mariner at the position from which the ship is normally
operated. The Display compass safe distance is 0.7 m. The Display does not require external
illumination during operation, as it has an internal backlight; the use of illuminated keys ensures
that all controls are visible.
The Pilot Plug should be installed on the bridge near the pilot’s operating position. It is
recommended that a suitable mains outlet (3-pin 120 V AC) should be available at this location.
Special siting considerations apply to antennas. These principles are outlined in section 5.4; for
detailed advice, see the IMO Guidelines.
5.2 AIS Transponder unit
The transponder mounting plate is attached by four M6 screws. Keyhole slots in the plate allow
two screws to be inserted in the mounting surface, then the plate to be mounted on the screws
and to be self-supporting while the remaining screws are inserted and all screws are tightened.
The transponder chassis is then attached to the plate using four screws, as shown overleaf. The
transponder may be mounted at any angle.
It is recommended to leave at least 300 mm free space around the terminals to allow for
connection cables.
5.2.1 Transponder main dimensions